The most objective way to construct a phylogeny is to focus on characters:

Question

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The most objective way to construct a phylogeny is to focus on characters inherited from a common ancestor. This is because these characters are more likely to accurately reflect the evolutionary relationships between organisms. Characters that are large in size or confer adaptedness to a particular habitat may not be as reliable, as they could have evolved independently in different lineages. Additionally, characters acquired during an organism's lifetime are not inherited and would not be informative for constructing a phylogeny.

The Most Objective Way to Construct a Phylogeny Is to Focus